Mark Lenard is one of the few actors ever to portray three different aliens on Star Trek: a Romulan, a Klingon and a Vulcan.

In addition to appearing in several Star Trek shows and movies as Spock's father, Sarek, Lenard also played the very first Romulan ever seen and played the first Klingon to feature a "forehead" (the lumpy forehead prosthetics).

Had to have his hair dyed and makeup applied to his face to make him look older while playing Sarek, the Vulcan father of Spock on "Star Trek" (1966) because in reality he wasn't that much older than Leonard Nimoy, who played Spock.